There's a problem with software on some of them that disables the low tire pressure warning light.
<https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
Cranky old white hairs like me wonder what's wrong with a walk around and a tire pressure gauge.

On 6/28/2022 1:37 PM, Dean Hoffman wrote:
> There's a problem with software on some of them that disables the low tire pressure warning light.
> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
> Cranky old white hairs like me wonder what's wrong with a walk around and a tire pressure gauge.

Aren't the "per wheel" pressures displayed in real-time? Can't
the driver notice that a tire is low or, in our case, high (due
to increasing ambient temperatures)?

On 6/28/22 13:37, Dean Hoffman wrote:
> There's a problem with software on some of them that disables the low tire pressure warning light.
> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
> Cranky old white hairs like me wonder what's wrong with a walk around and a tire pressure gauge.

Hah, I wish my Tacoma had that "feature". Damn light is forever if you
don't shell out a lot of money for new transmitters when the batteries
die after about 10 years!

Google Groups garbage...

--
Dean Hoffman <deanh6929@gmail.com> wrote:

> X-Received: by 2002:adf:ec4f:0:b0:21b:90c0:139e with SMTP id w15-20020adfec4f000000b0021b90c0139emr19540932wrn.550.1656448658066;
> Tue, 28 Jun 2022 13:37:38 -0700 (PDT)
> X-Received: by 2002:a81:58a:0:b0:318:572:53eb with SMTP id 132-20020a81058a000000b00318057253ebmr23895353ywf.250.1656448657332;
> Tue, 28 Jun 2022 13:37:37 -0700 (PDT)
> Path: not-for-mail
> Newsgroups: sci.electronics.design
> Date: Tue, 28 Jun 2022 13:37:37 -0700 (PDT)
> Injection-Info: google-groups.googlegroups.com; posting-host=2603:80a0:1b01:ef00:59b3:6655:9bfb:1e1;
> posting-account=41L0jAoAAADONNlHkKunxCOXYSiDJt3O
> NNTP-Posting-Host: 2603:80a0:1b01:ef00:59b3:6655:9bfb:1e1
> User-Agent: G2/1.0
> MIME-Version: 1.0
> Message-ID: <7f4e8b9d-f097-4c92-9f94-c6500c9301a8n@googlegroups.com>
> Subject: Ford F 150 Recall
> From: Dean Hoffman <deanh6929@gmail.com>
> Injection-Date: Tue, 28 Jun 2022 20:37:38 +0000
> Content-Type: text/plain; charset="UTF-8"
> X-Received-Bytes: 1486
>
> There's a problem with software on some of them that disables the low tire pressure warning light.
> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
> Cranky old white hairs like me wonder what's wrong with a walk around and a tire pressure gauge.

Troll Doe stated the following in message-id
<svsh05$lbh$5@dont-email.me>
(http://al.howardknight.net/?ID=164904625100) posted Fri, 4 Mar 2022
08:01:09 -0000 (UTC):

> Compared to other regulars, Bozo contributes practically nothing
> except insults to this group.

Yet, since Wed, 5 Jan 2022 04:10:38 -0000 (UTC) Troll Doe's post ratio
to USENET (**) has been 66.2% of its posts contributing "nothing except
insults" to USENET.

** Since Wed, 5 Jan 2022 04:10:38 -0000 (UTC) Troll Doe has posted at
least 2456 articles to USENET. Of which 176 have been pure insults and
1451 have been Troll Doe "troll format" postings.

The John Doe troll stated the following in message-id
<sdhn7c$pkp$4@dont-email.me>:

> The troll doesn't even know how to format a USENET post...

And the John Doe troll stated the following in message-id
<sg3kr7$qt5$1@dont-email.me>:

> The reason Bozo cannot figure out how to get Google to keep from
> breaking its lines in inappropriate places is because Bozo is
> CLUELESS...

And yet, the clueless John Doe troll has continued to post incorrectly
formatted USENET articles that are devoid of content (latest example on
Tue, 28 Jun 2022 21:19:15 GMT in message-id
<nfKuK.47035$LfE9.24100@usenetxs.com>).

NOBODY likes the John Doe troll's contentless spam.

This posting is a public service announcement for any google groups
readers who happen by to point out that John Dope does not even follow
the rules it uses to troll other posters.

bnt0lBsLFfmN

In article <t9fqvb$16j7b$1@dont-email.me>, wwm@wwmartin.net says...
>
> Hah, I wish my Tacoma had that "feature". Damn light is forever if you
> don't shell out a lot of money for new transmitters when the batteries
> die after about 10 years!
>
>
>

Same here For what should be a few dollars I was asked for about $ 70
per wheel. Just like the high price of the fobs that many cars are now
using.

On 6/28/2022 4:51 PM, Don Y wrote:
> On 6/28/2022 1:37 PM, Dean Hoffman wrote:
>>     There's a problem with software on some of them that disables the
>> low tire pressure warning light.
>>
>> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
>>
>>     Cranky old white hairs like me wonder what's wrong with a walk
>> around and a tire pressure gauge.
>
> Aren't the "per wheel" pressures displayed in real-time?  Can't
> the driver notice that a tire is low or, in our case, high (due
> to increasing ambient temperatures)?
>

Having real-time information on when you've blown a tire can help you
get the car off the road more quickly, and on some low-sitting vehicles
can help prevent further damage to the car

On Tuesday, 28 June 2022 at 22:51:34 UTC+2, Don Y wrote:
> On 6/28/2022 1:37 PM, Dean Hoffman wrote:
> > There's a problem with software on some of them that disables the low tire pressure warning light.
> > <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
> > Cranky old white hairs like me wonder what's wrong with a walk around and a tire pressure gauge.
> Aren't the "per wheel" pressures displayed in real-time? Can't
> the driver notice that a tire is low or, in our case, high (due
> to increasing ambient temperatures)?
recall is recall
bug is bug

Low quality software resulted in 2 Boeing MAX MCAS crashes
and the latest crash in China

==
MCAS – Boeing 737 MAX Updates
https://www.boeing.com › 737-max-updates › mcas

What does MCAS do? MCAS, or Maneuvering Characteristics Augmentation System, provides consistent airplane handling characteristics in a very specific set of unusual flight conditions. MCAS now contains multiple enhanced protections: Measurements from two Angle of Attack (AOA) sensors will be compared.

MCAS

O MCAS, ou Sistema de Estabilização Automática, oferece características …
Deutsche

Wie funktionierte das MCAS ursprünglich? Vor seiner Weiterentwicklung verließ …

Statements

READ (November 18, 2020): Boeing Responds to FAA Approval to Resume …
SMS Terms

737 MAX. 747-8. 767. 777. 777X. 787. Freighters. Commercial Services. Boeing …

Pokaż wyniki tylko z usługi boeing.com
boeing.com
MCAS
Deutsche
Statements
SMS Terms
Otwórz witrynę internetową
Boeing: The 737 MAX MCAS Software Enhancement
https://www.boeing.com › commercial › 737max › 737-max...

OverviewBackgroundThe role of MCAS in accidentsDescriptionTechnology readinessScrutinySupporting systemsRunaway stabilizer and manual trim

The Maneuvering Characteristics Augmentation System (MCAS) is a flight stabilizing program developed by Boeing that became notorious for its role in two fatal accidents of the 737 MAX, which killed all passengers and crew on both flights, 346 people in total. MCAS was first used on Boeing KC-46 Pegasus military air tanker to balance fuel loads, but the aircraft, which was

tirsdag den 28. juni 2022 kl. 23.58.28 UTC+2 skrev Ralph Mowery:
> In article <t9fqvb$16j7b$1...@dont-email.me>, w...@wwmartin.net says...
> >
> > Hah, I wish my Tacoma had that "feature". Damn light is forever if you
> > don't shell out a lot of money for new transmitters when the batteries
> > die after about 10 years!
> >
> >
> >
> Same here For what should be a few dollars I was asked for about $ 70
> per wheel. Just like the high price of the fobs that many cars are now
> using.

tens seconds with google find 4 sensors for $30 at walmart.....

On Wednesday, 29 June 2022 at 00:33:47 UTC+2, lang...@fonz.dk wrote:
> tirsdag den 28. juni 2022 kl. 23.58.28 UTC+2 skrev Ralph Mowery:
> > In article <t9fqvb$16j7b$1...@dont-email.me>, w...@wwmartin.net says...
> > >
> > > Hah, I wish my Tacoma had that "feature". Damn light is forever if you
> > > don't shell out a lot of money for new transmitters when the batteries
> > > die after about 10 years!
> > >
> > >
> > >
> > Same here For what should be a few dollars I was asked for about $ 70
> > per wheel. Just like the high price of the fobs that many cars are now
> > using.
> tens seconds with google find 4 sensors for $30 at walmart.....
Aliexpress

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https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20220628152013&SearchText=tire+pressure+sensors&spm=a2g0o.home.1000002.0

On 6/28/2022 4:37 PM, Dean Hoffman wrote:
> There's a problem with software on some of them that disables the low tire pressure warning light.
> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
> Cranky old white hairs like me wonder what's wrong with a walk around and a tire pressure gauge.

Most late-model cars will show you the tire pressure of each tire on the
dash display, also.

It's annoying when on occasion they rotate the tires but then forget to
reprogram the computer so it knows what wheel which sensor is on, this
requires a tool:

<https://www.amazon.com/dp/B083XJSK8K/ref=sspa_dk_detail_3?psc=1&pd_rd_i=B083XJSK8K>

Eddie, the Astraweb nym-shifting troll is/was flagging off-topic posts
with its copy of my ID, then replies to its own post. Strange but true.

Eddie has never posted anything NORMAL except when it got a spanking...

https://groups.google.com/g/sci.electronics.repair/c/MesPLcGU4BE

See also...
Edward H. <dtgamer99 gmail.com>
Edward Hernandez <dtgamer99 gmail.com>
Peter Weiner <dtgamer99 gmail.com>
John Doe <always.look message.header> (Astraweb, Aioe.org)
Bertrand Sindri <bertrand.sindri yahoo.com> (unlikely but possible)

--
John Doe <always.look@message.header> wrote:

> Path: eternal-september.org!reader01.eternal-september.org!2.eu.feeder.erje.net!feeder.erje.net!news.uzoreto.com!feeder.usenetexpress.com!tr1.eu1.usenetexpress.com!feeder3.usenet.farm!feeder4.usenet.farm!feeder1.feed.usenet.farm!feed.usenet.farm!news-out.netnews.com!news.alt.net!fdc2.netnews.com!peer02.ams1!peer.ams1.xlned.com!news.xlned.com!peer02.ams4!peer.am4.highwinds-media.com!news.highwinds-media.com!fx04.ams4.POSTED!not-for-mail
> From: John Doe <always.look@message.header>
> Newsgroups: sci.electronics.design,free.spam
> Subject: Ford F 150 Recall
> Followup-To: alt.test.group
> References: <7f4e8b9d-f097-4c92-9f94-c6500c9301a8n@googlegroups.com>
> Injection-Date: Tue, 28 Jun 2022 17:19:14 -0000 (UTC)
> Injection-Info: reader02.eternal-september.org; posting-host="aefae07b417003b570527823e77a9930"; logging-data="29200"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18QBXYPJWay5G0R7zD10mjY5gUD5xOvt6I="
> User-Agent: Xnews/2006.08.05
> Lines: 28
> Message-ID: <nfKuK.47035$LfE9.24100@usenetxs.com>
> X-Complaints-To: https://www.astraweb.com/aup
> NNTP-Posting-Date: Tue, 28 Jun 2022 21:19:15 UTC
> Date: Tue, 28 Jun 2022 21:19:15 GMT
> X-Received-Bytes: 2289
> Xref: reader01.eternal-september.org sci.electronics.design:672909 free.spam:20065
>
> Google Groups garbage...
>
>

In article <32a35bbc-b21d-4a2a-b1a1-aa82f01edfe8n@googlegroups.com>,
langwadt@fonz.dk says...
> Same here For what should be a few dollars I was asked for about $ 70
> > per wheel. Just like the high price of the fobs that many cars are now
> > using.
>
>
> tens seconds with google find 4 sensors for $30 at walmart.....
>
>

Then how much to get them installed ?

Troll Doe stated the following in message-id
<svsh05$lbh$5@dont-email.me>
(http://al.howardknight.net/?ID=164904625100) posted Fri, 4 Mar 2022
08:01:09 -0000 (UTC):

> Compared to other regulars, Bozo contributes practically nothing
> except insults to this group.

Yet, since Wed, 5 Jan 2022 04:10:38 -0000 (UTC) Troll Doe's post ratio
to USENET (**) has been 66.4% of its posts contributing "nothing except
insults" to USENET.

** Since Wed, 5 Jan 2022 04:10:38 -0000 (UTC) Troll Doe has posted at
least 2478 articles to USENET. Of which 176 have been pure insults and
1470 have been Troll Doe "troll format" postings.

The John Dope troll stated the following in message-id
<sdhn7c$pkp$4@dont-email.me>:

> The troll doesn't even know how to format a USENET post...

And the John Dope troll stated the following in message-id
<sg3kr7$qt5$1@dont-email.me>:

> The reason Bozo cannot figure out how to get Google to keep from
> breaking its lines in inappropriate places is because Bozo is
> CLUELESS...

And yet, the clueless John Dope troll has itself posted yet another
incorrectly formatted USENET posting on Tue, 28 Jun 2022 23:35:58 -0000
(UTC) in message-id <t9g38u$17air$18@dont-email.me>.

rToaWy18Ll79

On 6/28/2022 4:29 PM, bitrex wrote:
> On 6/28/2022 4:37 PM, Dean Hoffman wrote:
>> There's a problem with software on some of them that disables the low
>> tire pressure warning light.
>>
>> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
>>
>> Cranky old white hairs like me wonder what's wrong with a walk around and
>> a tire pressure gauge.
>
> Most late-model cars will show you the tire pressure of each tire on the dash
> display, also.
>
> It's annoying when on occasion they rotate the tires but then forget to
> reprogram the computer so it knows what wheel which sensor is on, this requires
> a tool:

There are some systems that DON'T place pressure sensors on the wheels.
They, instead, detect "low pressure" by noticing the different rates of
rotation of the tires (based on the ABS sensors). ("poor mans TPMS")

These "self calibrate", in a sense. Move a low tire and it will see that
the new location is rotating with an effective smaller diameter than the
others and flag *it* as being low (regardless of where it was previously
located)

On 6/28/2022 8:38 PM, Don Y wrote:
> On 6/28/2022 4:29 PM, bitrex wrote:
>> On 6/28/2022 4:37 PM, Dean Hoffman wrote:
>>>     There's a problem with software on some of them that disables the
>>> low tire pressure warning light.
>>> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
>>>
>>>     Cranky old white hairs like me wonder what's wrong with a walk
>>> around and a tire pressure gauge.
>>
>> Most late-model cars will show you the tire pressure of each tire on
>> the dash display, also.
>>
>> It's annoying when on occasion they rotate the tires but then forget
>> to reprogram the computer so it knows what wheel which sensor is on,
>> this requires a tool:
>
> There are some systems that DON'T place pressure sensors on the wheels.

To clarify on Chevrolets at least the direct sensors integrated into the
valve stems of the tires; I don't know if all brands do that with direct
sensors though but it seems common.

If just the module fails you can usually save the tire by pulling and
de-flating the tire a bit then slipping the new module around the stem &
hopefully can get away without re-balancing the wheel if you do this in
your driveway

> They, instead, detect "low pressure" by noticing the different rates of
> rotation of the tires (based on the ABS sensors).  ("poor mans TPMS")
>
> These "self calibrate", in a sense.  Move a low tire and it will see that
> the new location is rotating with an effective smaller diameter than the
> others and flag *it* as being low (regardless of where it was previously
> located)

Those used to suck but I guess nowadays some manufacturers like Audi can
get their indirect sensors pretty accurate and they can somehow detect
if all four tires are low or high, also

On Tuesday, June 28, 2022 at 6:18:27 PM UTC-4, bitrex wrote:
> On 6/28/2022 4:51 PM, Don Y wrote:
> > On 6/28/2022 1:37 PM, Dean Hoffman wrote:
> >> There's a problem with software on some of them that disables the
> >> low tire pressure warning light.
> >>
> >> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
> >>
> >> Cranky old white hairs like me wonder what's wrong with a walk
> >> around and a tire pressure gauge.
> >
> > Aren't the "per wheel" pressures displayed in real-time? Can't
> > the driver notice that a tire is low or, in our case, high (due
> > to increasing ambient temperatures)?
> >
> Having real-time information on when you've blown a tire can help you
> get the car off the road more quickly, and on some low-sitting vehicles
> can help prevent further damage to the car

??? I don't think the reading is that real time is it? When you've blown a tire, do you really need a dash gauge tell you?

--

Rick C.

- Get 1,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209

On Tuesday, June 28, 2022 at 9:05:30 PM UTC-4, bitrex wrote:
> On 6/28/2022 8:38 PM, Don Y wrote:
> > On 6/28/2022 4:29 PM, bitrex wrote:
> >> On 6/28/2022 4:37 PM, Dean Hoffman wrote:
> >>> There's a problem with software on some of them that disables the
> >>> low tire pressure warning light.
> >>> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
> >>>
> >>> Cranky old white hairs like me wonder what's wrong with a walk
> >>> around and a tire pressure gauge.
> >>
> >> Most late-model cars will show you the tire pressure of each tire on
> >> the dash display, also.
> >>
> >> It's annoying when on occasion they rotate the tires but then forget
> >> to reprogram the computer so it knows what wheel which sensor is on,
> >> this requires a tool:
> >
> > There are some systems that DON'T place pressure sensors on the wheels.
> To clarify on Chevrolets at least the direct sensors integrated into the
> valve stems of the tires; I don't know if all brands do that with direct
> sensors though but it seems common.
>
> If just the module fails you can usually save the tire by pulling and
> de-flating the tire a bit then slipping the new module around the stem &
> hopefully can get away without re-balancing the wheel if you do this in
> your driveway
> > They, instead, detect "low pressure" by noticing the different rates of
> > rotation of the tires (based on the ABS sensors). ("poor mans TPMS")
> >
> > These "self calibrate", in a sense. Move a low tire and it will see that
> > the new location is rotating with an effective smaller diameter than the
> > others and flag *it* as being low (regardless of where it was previously
> > located)
> Those used to suck but I guess nowadays some manufacturers like Audi can
> get their indirect sensors pretty accurate and they can somehow detect
> if all four tires are low or high, also

I've been told in the Teslas, the sensor is mounted so it passes close to a pickup that both inductively couples for transmitting a signal, but also to supply power to the sensor. That is why the tire pressure won't show up until you are something like a quarter mile down the road. It needs a few rotations to fire up the pressure sensor.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

On Tuesday, June 28, 2022 at 4:37:44 PM UTC-4, dean...@gmail.com wrote:
> There's a problem with software on some of them that disables the low tire pressure warning light.
> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
> Cranky old white hairs like me wonder what's wrong with a walk around and a tire pressure gauge.

Sounds like the article states the cold tire pressure was set at 35 psi instead of 42, meaning the low pressure warning threshold is low by about 7 psi, meaning you're not going to get a warning for a low pressure that causes loss of control. When Ford says loss of control they really mean it.

On 06/28/2022 03:58 PM, Ralph Mowery wrote:
> In article <t9fqvb$16j7b$1@dont-email.me>, wwm@wwmartin.net says...
>>
>> Hah, I wish my Tacoma had that "feature". Damn light is forever if you
>> don't shell out a lot of money for new transmitters when the batteries
>> die after about 10 years!
>>
>>
>>
>
> Same here For what should be a few dollars I was asked for about $ 70
> per wheel. Just like the high price of the fobs that many cars are now
> using.
>

The rims I use for the studs in the winter don't have sensors so I'm
used to the light being on. I'm also used to the slow leaker that needs
airing up every month or so.

The last time I got a new set of tires I foolishly thought I would miss
the ever popular valve stem charge. Nope, they charge for 'rebuilding'
the transmitter.

On 06/28/2022 05:42 PM, Ralph Mowery wrote:
> In article <32a35bbc-b21d-4a2a-b1a1-aa82f01edfe8n@googlegroups.com>,
> langwadt@fonz.dk says...
>> Same here For what should be a few dollars I was asked for about $ 70
>>> per wheel. Just like the high price of the fobs that many cars are now
>>> using.
>>
>>
>> tens seconds with google find 4 sensors for $30 at walmart.....
>>
>>
>
> Then how much to get them installed ?
>
>
$62.50 per wheel...

On 6/28/2022 10:23 PM, Ricky wrote:
> On Tuesday, June 28, 2022 at 6:18:27 PM UTC-4, bitrex wrote:
>> On 6/28/2022 4:51 PM, Don Y wrote:
>>> On 6/28/2022 1:37 PM, Dean Hoffman wrote:
>>>> There's a problem with software on some of them that disables the
>>>> low tire pressure warning light.
>>>>
>>>> <https://www.reuters.com/business/autos-transportation/ford-recalls-2900-ev-f-150-lightning-pickup-trucks-2022-06-27/>
>>>>
>>>> Cranky old white hairs like me wonder what's wrong with a walk
>>>> around and a tire pressure gauge.
>>>
>>> Aren't the "per wheel" pressures displayed in real-time? Can't
>>> the driver notice that a tire is low or, in our case, high (due
>>> to increasing ambient temperatures)?
>>>
>> Having real-time information on when you've blown a tire can help you
>> get the car off the road more quickly, and on some low-sitting vehicles
>> can help prevent further damage to the car
>
> ??? I don't think the reading is that real time is it? When you've blown a tire, do you really need a dash gauge tell you?
>

I've never actually "blown" a tire as in a catastrophic failure where
the pressure drops to almost nothing instantly that I recall, so
"blowout" is the wrong term.

I've hit nails, etc. and started pretty rapidly losing pressure, though,
like 38...37...36...35 where you can count one-mississippi between each
psi and yes in the late-model cars it's happened to me in it pops up the
tire pressure display once it hits the low pressure-threshold and you
can see it fall in real time, or close to it

On 6/28/2022 5:58 PM, Ralph Mowery wrote:
> In article <t9fqvb$16j7b$1@dont-email.me>, wwm@wwmartin.net says...
>>
>> Hah, I wish my Tacoma had that "feature". Damn light is forever if you
>> don't shell out a lot of money for new transmitters when the batteries
>> die after about 10 years!
>>
>>
>>
>
> Same here For what should be a few dollars I was asked for about $ 70
> per wheel. Just like the high price of the fobs that many cars are now
> using.

On late-model cars you can use two fobs to program infinite additional
blank fobs.

If you've lost a fob and only have one then things get real interesting.
In theory in the US you only need one fob to make a second (vs Canada
where you need at least two to do anything) however the process for
programming a replacement yourself on Chevy cars at least becomes 10x
more byzantine with only one, and the chances you brick your remaining
fob and/or brick the car trying to do it yourself are IMO at least 50/50.

I just called a locksmith the time I was in that situation.

On 6/28/2022 6:05 PM, bitrex wrote:

>> They, instead, detect "low pressure" by noticing the different rates of
>> rotation of the tires (based on the ABS sensors). ("poor mans TPMS")
>>
>> These "self calibrate", in a sense. Move a low tire and it will see that
>> the new location is rotating with an effective smaller diameter than the
>> others and flag *it* as being low (regardless of where it was previously
>> located)
>
> Those used to suck but I guess nowadays some manufacturers like Audi can get
> their indirect sensors pretty accurate and they can somehow detect if all four
> tires are low or high, also

ABS has to sense small changes in rotational speed to determine the onset of
a skid. So, that sets the threshold for how "flat" a tire can be and be
noticeable.

Not sure if detecting all four in an identical -- but over/under-inflated
state -- would be possible without another reference. E.g., if you had a road
facing camera (like for lane monitoring), you might be able to deduce speed
over ground and compare that to the "sensed" speed based on tire rotation
(assuming the dashed lines on roads have some standard governing their
spacing?)

On Wednesday, 29 June 2022 at 07:46:47 UTC+2, Don Y wrote:
> On 6/28/2022 6:05 PM, bitrex wrote:
>
> >> They, instead, detect "low pressure" by noticing the different rates of
> >> rotation of the tires (based on the ABS sensors). ("poor mans TPMS")
> >>
> >> These "self calibrate", in a sense. Move a low tire and it will see that
> >> the new location is rotating with an effective smaller diameter than the
> >> others and flag *it* as being low (regardless of where it was previously
> >> located)
> >
> > Those used to suck but I guess nowadays some manufacturers like Audi can get
> > their indirect sensors pretty accurate and they can somehow detect if all four
> > tires are low or high, also
> ABS has to sense small changes in rotational speed to determine the onset of
> a skid. So, that sets the threshold for how "flat" a tire can be and be
> noticeable.
>
> Not sure if detecting all four in an identical -- but over/under-inflated
> state -- would be possible without another reference. E.g., if you had a road
> facing camera (like for lane monitoring), you might be able to deduce speed
> over ground and compare that to the "sensed" speed based on tire rotation
> (assuming the dashed lines on roads have some standard governing their
> spacing?)
--if you had a road
facing camera (like for lane monitoring), you might be able to deduce speed
over ground and compare that to the "sensed" speed based on tire rotation

fake
GPS senses car's speed much better